Improve explanatory comments; Add reference

Author: harshitpant1

algorithms/Searching/jump_search.m

@@ -1,21 +1,29 @@
 function found_at = jump_search(input_array, search_key)
-  % Contributed by   - Harshit Pant, harshitpant83@gmail.com
+  % Contributed by - Harshit Pant, harshitpant83@gmail.com
+  % Reference - https://en.wikipedia.org/wiki/Jump_search
 
-  % input_array - The input array, should be sorted in ascending order.
-  %               'input_array' can contain -ve numbers as well as non-integers.
+  % input_array - Holds the array in which the 'search_key' is to be searched.
+  %               It should be sorted in ascending order.
+  %               It can contain -ve numbers as well as non-integers.
   % search_key  - The value to be searched in the 'input_array'.
   % found_at    - The index at which 'search_key' is found in 'input_array'.
   %               -1 is returned if 'search_key' is not found in 'input_array'.
 
   array_length = length(input_array);
   found_at = -1; 
 
+  % Finding the optimum block_size to be jumped.
   block_size = sqrt(array_length); 
   block_size = round(block_size); 
 
+  % low and high denote the lower 
+  % and upper bound of a certain block.
   low = 1;
   high = 1 + block_size;
 
+  % Finding the block where the 'search_key' is present
+  % if low >= array_length, the 'search_key' is not found 
+  % in the 'input_array', thus, -1 is returned.
   while input_array(min(high, array_length)) < search_key
       low = high;
       high = high + block_size;
@@ -24,22 +32,25 @@
       endif;
   endwhile;
 
+  % Now that the required block is found,
+  % running a linear search within the block 
+  % to find the 'search_key'
   while input_array(low) < search_key
       low = low + 1;
       if low > min(high, array_length)
           return;
       endif;
   endwhile;
 
+  % Checks if the 'search_key' was found within
+  % the block. If found, the index is returned.
+  % If not -1 is returned.
   if input_array(low) == search_key
       found_at = low;
   endif;
 
 endfunction;
 
-
 % TEST: 
-% Save this file to your local computer, then use the command:
-% jump_search([-11.1, -3.3, -1.3, 0.1, 1.5, 3.5, 3.9, 5.5, 7.5, 9.6, 13.7, 21.3, 35.9], 7.5)
-% This should return, ans = 9.
-% TODO - Transfer this test when automated testing functionality is added to this repository.
+% jump_search([-11.1, -3.3, -1.3, 0.1, 1.5, 3.5, 3.9,...
+% 5.5, 7.5, 9.6, 13.7, 21.3, 35.9], 7.5) == 9